3) vault settlement
拱顶下沉
1.
For example,the probability distributions of the maximum ground subsidence and the vault settlement appear to be approximately normal ones.
同时还得到几点地层变形规律,如:最大地表沉降和拱顶下沉值的概率分布近似成正态分布;随着围岩稳定性由好变坏,地表沉降和拱顶下沉值也呈逐渐增大的趋势;隧道跨度为5~10m时,II,III,V类围岩条件下的最大地表沉降值与上覆土层厚度关系呈凸形状,II,III类围岩的最大拱顶沉降值在埋深25m范围内随隧道埋深增大而增大;拱顶沉降与地表沉降比值多为0。
2.
Authors analyzed the inner forces of initial support and secondary lining,safety factor,convergence of tunnel inner perimeter,vault settlement and distribution of plastic zone in surrounding rock,evaluated the safety of lining structure.
针对榆树沟隧道工程实际情况,选取了3种不同的复合式衬砌结构类型进行数值计算,对初期支护和二次衬砌的内力、安全系数及洞周位移、拱顶下沉、围岩塑性区的分布等进行了分析,评价了衬砌结构的安全性。
3.
Based on field monitoring data of more than fifty two-lane highway tunnels,the data of convergence displacements and vault settlements were analyzed through statistical method.
基于50多条两车道NATM高速公路隧道的现场监测数据,通过对围岩收敛变形和拱顶下沉数据的统计分析,探讨隧道II,III,IV,V级围岩随时间的变形特性,得到不同级别围岩隧道从开挖到变形稳定的时间,分析稳定时间与围岩级别的关系,为隧道施工阶段围岩的稳定性评价以及二次衬砌的合理施做时机提供依据。
4) vault crown settlement
拱顶下沉
1.
By site monitoring,such as ground settlement,clearance convergence,vault crown settlement and site observation, etc.
以景(德镇)婺(源)黄(山)高速公路姚村坦连拱隧道施工中出现的险情为例,结合地表沉降、洞内净空收敛及拱顶下沉进行观测及现场观察,针对隧道出口段围岩失稳导致中导洞右侧工字钢严重内敛现象进行了动态预报,从而为及时采取有效措施排除险情争取了时间,避免了重大事故的发生,以此进一步说明了监控量测在隧道修建过程中的必要性。
2.
After analyzing the vault crown settlement tendency of the tunnel and the factors affected it,the Genetic algorithm neural network model for predicting the vault crown settlement has been created.
因此,作者在分析了隧道拱顶下沉规律及其主要影响因素的基础上,采用基于遗传算法的神经网络建立了隧道拱顶下沉时序的预测模型。
3.
Due to lag of settlement monitoring,measured vault crown settlement is merely a portion of total settlement in construction of city metro tunnel,and ratio of measured settlement to total settlement varies notably with ground condition.
由于变形监测的滞后,在城市地铁隧道施工中所测到的拱顶下沉通常仅为总下沉量的一部分,并且其所占的比例在不同地层条件下具有较大差异。
5) vault subsidence
拱顶下沉
1.
In land sections of Xiang′an subsea tunnel in Xiamen with unfavorable geological condition,where large-section shallow-buried excavation method is adopted,the vault subsidence of some sections exceeds allowable value obviously.
厦门海底隧道两端陆域软弱地段大断面浅埋暗挖施工中,部分断面拱顶下沉偏大。
6) crown settlement
拱顶下沉
1.
By the in_suit measure, regression analysis and numerical simulation of ground & crown settlement in Shenzhen Metro PhaseⅠProject section tunnel, an exponential function method is used to predict the unmeasured crown settlement and numerical simulation to crown s pre_settlement.
通过对深圳地铁一期工程区间隧道地表、拱顶下沉的现场实测及回归分析和数值模拟,提出了预测拱顶下沉的指数函数方法和超前拱顶下沉数值模拟方法。
补充资料:极限拱顶高度试验
极限拱顶高度试验
limit dome height test
j ixian gongding gaodu shiyan极限拱顶高度试验(limit dome height test) 一种评估金属薄板成形性的试验方法,是杯突试验的改进。用以确定金属薄板在各种应变状态下的极限应变值。简称LDH试验。由于成形极限图的精度、重复性和稳定性较差,而一般的双向拉伸试验也只能提供等双向拉伸应变状态的试验参数,因此发展了极限拱顶高度试验。 试验方法类似于双向拉伸试验。工具有半球形凸模、凹模和带压边筋的压边圈。试验时,用球头凸模将金属板压入凹模。试样被压边圈压紧,以便使试样边缘的金属不能向凹模孔内流动。试验前在不同宽度的试样表面印制上网格。试验时在板料发生失稳或断裂的瞬间停机,并测量试徉的横向应变(短轴应变)。:和拱顶高度H,在以。:和H/凸模半径为横纵坐标轴的坐标系中标出不同宽度试样的试验点,把试验点相连即得图示的LDH曲线。LDH曲线与成形极限曲线形状相似,但要比制作成形极限曲线简便,并且在润滑条件相同的情况下,试验结果的重复性和稳定性都大大优于成形极限曲线。LDH曲线在坐标系中的位置越高,说明薄板在不同应变状态下的极限拉伸应变量越大,因此薄板的成形性能越好。 0 .74厂一一一一一一一门—~—一一一-门 0 .70卜一公幸、二乡」{ 哪。“L了场】卜洛」}/月 罗0 .66卜七‘暇.丫,1/} 升“’一{t少翅弓人{/} 旧}、{/1} 泛。62卜、}空_} o‘’8…圣翌eses二… 一10一5 0 5 10 E2 LDH曲线 (唐获)
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条